Spark-plug.



J. BLOMSTER & J. SCHABEN.

SPARK PLUG.

APPLICATION FILED 1AN.3I. I9II.

1,279,974. I Patented Sept. 24, 1918.

T (9 5 o r 727M415? w v /md UNITED STATES PATENT OFFICE.

JOEL BLOMSTER AND JOSEPH SCI-IAIBEN, OF ALGONA, IOWA.

SPARK-PLUG.

has for its principal object to provide a is caused between plug of this character which embodies a pair of hollow spark electrodes or points, in which the gas is adapted to be compressed and subsequently exploded when the spark said points, this explosion of a miniature charge of gas within each point serving to etfectivel vent the accumulation of points.

Another object of the invention is to make clean and precar-bon on the the central electrodefof straight tube-like formation, and to make the other eccentri- 'cally located point 'of tube-like formation,

and to dispose this latter point at an angle to the central point so that the force of the explosion' of each miniature charge of gas in each of the points will be directed toward each other at a common point so as to more effectively keep and maintain the free ends of the points clean and free from carbon.

A further object of the invention is to bevel the opposing faces of said points.

A still further object of the invention is to provide a copper or other metallic conductor sleeve and to position the same within the spark plu shell, so that the outer surface of the con uctor sleeve is arranged in spaced relation to the inner surface of the shell, said sleeve being provided with an annular supporting flange whereby it may be held in position.

A still further object of the invention is to attach a tube-like point to the outer cir cumferential edge of the conductor sleeve and to dispose the tubular point in angular relation thereto and to the central electrode or spark point.

A still further object of the invention is to provide a pair of tube-like electrodes or points which may be detachably connected to the electrodes or points of any ordinary spark plug.

With these and other objects in view as Specification of Letters Patent. Application filed January 31, 1917.

Patented Sept. 24, 1918. Serial N0. 145,692.

will appear as the description proceeds, the invention comprises the various novel features of construction, combination and arrangement of parts as will be more fully described hereinafter and set forth with particularity in the appended claims.

Referring to the drawings,

Figure 1 is a side elevation of our im proved spark plug.

, ig. 2 is a vertical transverse sectional view takenon the line 2-2 of Fig. 1.

Fig. 3 is a perspective view of the spindle showing .one of the tubular points attached thereto.

Fig. 4 is a detail perspective view of the conductor sleeve showing one of the tubular points attached to the lower circumferential edge thereof.

Fig. 5 is a detail sectional el'evational view showing how the points may be attached to parts throughout the accomspark plug spindle which is provided at its upper end with the usual or any well known construction of washer, lock nut and clamping nut, 2, 3 and 4 respectively. The lower end of the spindle is provided with a collar or shoulder 5 to which is attached, and in this instance formed integral therewith, a tubular electrode or spark point 6 which projects therefrom in longitudinalalinement with the spindle a suitabl distance, the lower end of the point being provided with a beloved face as indicated by the numeral 7, the extreme lower end of the point being slightly rounded as indicated by the numeral 8. a

This spindle 1 is designed to be positioned through the usual insulating bushing 9 so that the collar or shoulder 5 rests within the recess 10 formed in the lower end of the bushing and is securely mounted therein by a packing 11 that is designed to form a tight joint between the shoulder or collar 5 and the bushing. The insulating bushing 9. is also provided with the usual circular flange 12 adjacent its lower end.

Arranged within the spark plugshell 13 and upon the shoulder 14 is a conductor sleeve 15 which may be formed of copper or other good conducting material, and is provided at its upper end with a supporting flange 16 that is designed to rest upon the shoulder 1i within the shell 13. As shown the conductor sleeve is positioned centrally within the lower end of the shell 13 so that the outer surface of the sleeve is disposed in spaced relation to the inner surface of the lower end of the shell, the only portion of the sleeve coming in contact with the shell being the supporting flange16.

A bearing ring 17 is positioned within the shell upon the supporting flange 16 and resting upon this bearing ring is the insulating bushing collar 12. Arranged around the collar 12 and between it and the shell 13 is a suitable packing 18 which is designed to be compressed through the medium of a lock collar 19 which is provided at its upper end with the usual nut 20 and at its lower end with external threads 21 whereby it may be threadedly engaged with the upper end of the shell 13, said looking collar serving further to hold and maintain the bushing and spindle aswell as the other parts of the spark plug in fixed relative position.

The conductor sleeve 15 has attached to its lower circumferential edge a tubular electrode or point 22, said point being disposed at an angle to the length of the sleeve, and at an angle to the central point 6 carried by the spindle. The inner surface of the point 22 is beveled as at 23 and is dis posed in opposed relation to the beveled face 7 of the point 6, the extreme lower end of the point 22 being rounded inwardly toward the rounded portion 8 of the point 6 as indicated by the numeral'24.

Froxnthe foregoing description, it will be apparent that when a spark plug of this character is positioned within the cylinder of an internal combustion engine, that as the piston moves u wardly to compress the charge of gas wit iin the cylinder of the engine, it will also up into each of the hollow tube-like points of the spark plug and compress the charge therein in such a manner that when the spark occurs between the points, the 1ninia ture charge of gas within each of the points will be exploded, the force of the explosion passing outwardly ofrthe points so as to effectively clean the points of any carbon deposits or oil that might otherwise accumulate thereon. In view of the fact that the point 22 is disposed at an angle to the center point, and in view of the fact that the inner opposed faces of the outer ends of the points are beveled, it will be'apparent that the force of the explosion within each point will pass outwardly and come together at a point opposite the beveled faces of the points, whereby the combined explosive force a charge of gas force of the charge within both of the points will serve to positively keep the points free from oil and carbon.

By the use of the conductor sleeve so as to support the. point 22, it will be apparent that no carbon can collect around this point, as the lower supporting end of the conductor sleeve projects a suitable distance beyond the lower end of the shell wherebyit will be apparent that this lower edge of the point will be subjected to the heat of the explosive gases which will burn and consume any carbon deposits that may collect around the connection ofthe point with the sleeve. 1

If desired the points .6 and 22 may be made separate and attached to the electrodes or points 25 and 26 of any well known or standard construction of spark plug 27, the use of the conductor sleeve 15 in this instance being entirely dispensed with, as clearly shown in Fig. 5 of the drawings.

7 \Vhat we claim is a l. Ina spark plug, a central tubular spark point, an eccentrically 'mounted tubular spark point disposed at an angle to said central spark point, the outer opposed ends of said spark points being beveled substantially as described.

2. In a spark plug, spark points disposed a pair I of tubular when the spark between said points occurs, the charge of gas in each tubular point will be exploded, serving to clean the points of carbon or other foreign deposits. a

3. In a spark plug, a combination with the spark points thereof, of a pair of tubular spark'points, each having one end fitted over and rigidly attached to the end of one of said first named spark points to form a gas pocket within each tubular spark point. e

4. In a spark plug, a conductor sleeve adapted to be positioned Within the shell of the spark plug, a. supportingfiange carried the upper end of said sleeve and adapted to rest upon the shoulder within the shell to support the sleeve in position, a tubular spark point carried by the lower end of said sleeve, and a tubular spark point carried by the spindle of the spark plug.

In testimony whereof we havesigned our names to this specification in the presence of two subscribing witnesses.

JOEL BLOMSTER. JOSEPH SCHABEN.

Witnesses:

Jos HJUWADSWORTH, LEWIS H. SMITH.

in angular relation to each other and adapted to IGCQlW-B a charge of gas under compression whereby the force of said explosion p iii; 

